Collet chuck



Patented July 24, 1951 BertholdDen zler, Chicago,jlll lassignorto 1 tltroducts -Co.,-Ghicago, 111., a partnership con- .sisting of @Berthold D handler Application May is, 1947.;seriam0.assists sol-aims. (cigars- 59195. a

1 'Ihisinvention relates to collet chucks.

i It isone oftthe objects ,of the present invention toprovide a colletchuck which is adapted for use oniordinary lathesand which is simpleandeco- :nom-ical of construction and .reliablein action.

LIt ista further object "of the present invention to-provide a: collet chuck of the above mentioned character which -has a minimum .nuniberlof parts that are movable with respect to one another ini-thezlactuationof the-collet from-itsgripping itoiitsnon-gripping position.

Itiis a'stillfurtherobject of the present invention'to provide a collect chuck sic-constructed as itoafiord a minirn'um interference with the working ofische machineon which rthewch'uck is provided. v i y a i l Flhe-attainment of thesabovesand further objects of ,the present inventions will be apparent (from the following specification taken inconjunction with theraccompanying drawingforma ingraypart thereof.

In the drawing:

Figure 1 is a side view of a collet chuck embodying the present invention;

Figure 2 is a front view thereof;

Figure 3 iswf'a sectional view taken along the lined-3 ofFigure 2; a A i i Figure l is a fragmentary sectional View taken along the line 4--4 of Figure 2; and.

Figure 5 is a rear view taken along the line 5-5 of'lFigure 3. W iRef'erenoe may .now .be had :more particularly to theidrawing wherein like reference numerals designateflike parts throughout. I

The collet chuck is indicated in generaltby the reference numeral "I and comprises a collet-receiving socket 2 for receiving a collet 3. The collet-receiving socket 2 comprises a cylindrical sleeve portion 5 having a tapered surface 6 for cooperating with the correspondingly tapered surface 1 on the collet 3. The sleeve has a circular peripheral flange I ll integral therewith and from which there extends a cylindrical portion I I coaxial with the sleeve 5 and which has a mounting flange IZwhich has bolt holes I? whereby it may be mounted by means of a series of bolts 14 to the rotatable portion of a machine such as a lathe. The rear surface of the flange I and the inner surface of the cylindrical portion II together form a pocket I for a purpose to be more fully set forth as this description proceeds. The cylindrical portion of the sleeve has a pair of slots lB-IG milled therein in each of whichis pivotally mounted a dog I1 as by a pivot pin [8.

Each dog includes a rounded nose portion I8 and slits Zt therein; spaced 3L2D- 1 apart} and extending for a substantial distance along. the collet, thus dividing the head .into three laws, as is usual;

The back of the tubulainportion f the collet is screw threaded :as, indicated :at E:The Ico11e t is inserted {through zthB socket 2 and threads into a. holding plate 3|. The holding plate is held against turning ain -aanys'desired manner, as by a pairyof pin-s fizthatiare held on the iback surface of the circular peni-pheral filange ln and extend through slightly v oversized -holes in the holding ,platel ilhe c ollet' threads-into the plate 3! so that thereafterfthewcolletfi together with the plate .3! are movableyas alunitina direction'axially of the collet. i 1 .Means isprovi-dedzforxmovingzthe collet axially ashortrdistanceto cause 'lihe colletjaws togrip or releasea piece of work thatwmay be inserted kinto'thelcollet. The means for moving the collet comzprisesra short ring i-ortsleeve 1-34 that makes a sliding fit-:on the smooth circular exterior :of "the sleeve 15 of thecolletweceivingsocket; The sleeve :34 is shi'ftable axially of the sleeve Bwasby a .ha-ndl-e 31H pivoted at 39 to lastandard All that a is bolted :to the lathe. .The handle 138 is bifurcated 'andrembracesi'the ring-rorisleeveztl and is proivided "with re "pair of arcuate :xshoes Ms-42 that are pivotedto it. erhandleiby :pivot pins 43 that are :part" of :the :shoes. The shoes enter. and ride :in 3a rc-ircular iOUlIWH-IdlYhfEiCifiE channel-shaped grcoveitfiuin the lining: orrsleeve 1134. The 133111543 :arelslida-ble lengthwise inzth'e-"holes inthehandle. *When the handle; 38 cis'imoved .tfrom :the position illustrated in Figure lhiillflva counter-clockwise direction about thetpivotstflias a center it causes :the shoes 42 to engagettheiflanges'of thechannel 45 and move the sleeve 34 to the left. Movement of the sleeve 34 to the left causes an inclined carnming surface 48 thereof to ride between the outer periphery of the sleeve 5 and the rounded noses IQ of the dogs I 1 and cause the dogs to swing about their respective pivots [8. The back camming surface 20 of each dog then forces the plate 3| in a direction to the left as seen in Figure 3, which holding plate draws the collet 3 leftward with it thus forcing the three jaws 21-21-41 towards one another to grip a piece of stock that may have been inserted into the chuck. A reverse movement of the handle causes the ring or sleeve 34 to be retracted from under the dogs and permits the collet to be shifted in the sleeve 5 in a direction to the right as seenv in Figure 3 and thus permits the Work or stock to be withdrawn from between the jaws of the collet.

When the dogs I1 are in the position illustrated in Figure 3 the collet 3 may be manually rotated with respect to the plate 3| thereby to effect an adjustment of the collet with respect to the collet-receiving sleeve 5, thus varying the 3 extent to which the three jaws are forced towards one another by-the full movement of the handle 7 38, as may be necessary for gripping different sizes of work stock.

During Operation of the lathe the ring or sleeve 34 rotates with the sleeve so that the ring '34,

the sleeve 5, the dogs I! and the collet 3 with its the plate, a plurality of dogs pivoted on the flange end extending forward thereof and each having I a camming surface engaging the plate for moving associated plate 3| all turn as one integral unit.

When the sleeve 34 is moved to its work chucking position the amount of movement is generally such that the rounded nose portions of the dogs I! ride up on the cylindrical'surface 35 of the ring 34. This surface is coaxial with the longi-..,

tudinal axis of the collet and of the circular sleeve 5 so that the force of the dogs on the ring or sleeve 34 has no component tending to shift the ring or sleeve to the right, that is, to its releasing p smm; However, when the work is of larger diameter the rounded .nose portions of the dogs may not quite reach the cylindrical surface 35 and agripping action is obtained'by the collet nevertheless. i i In compliance with the requirements 'of the patent statutes I have here shown and described a" preferred embodiment of my invention. It is, however, to be understood that the invention is not limited to the precise construction here shown, the same being merely illustrative of the principles of the invention. 'What I consider new and desire to secure by Letters Patent is:

1. A collet chuck comprising a collet receiving socket including a sleeve, a collet extending thereinto, said sleeve having a peripherally extending mounting flange at the rear thereof and having an enlarged pocket open at the rear thereof and'surrounded by the flange, said collet having a threaded end extending into said pocket, a plate in saidpocke't and held against rotation thereinbut movable therein axially of the sleeve, said threaded end of the collet being threaded into the plate, and a plurality of dogs pivoted on the flange and extending forward thereof and each having a camming surface engaging the plate and operable for moving it in said pocket.

2. A collet chuck comprising a collet receiving socket including a sleeve, a colletextending thereinto,*said sleeve having'a peripherally extending mou'nting'fiange at the rear thereof and having an enlargedpocket open at therear thereof and surrounded by the flange, said collet havinga threaded end extending into said pocket, a plate it in said pocket, a ring slidable on said socket and having an inclined surface adapted to engage the dogs for pivoting them into camming engagement with the plate as the ring is moved on the socket, and means for moving the ring lengthwise of the socket.

3. A collet chuck comprising a collet receiving socket including a sleeve, a collet extending thereinto, said sleeve having a peripherallyextending mounting flange at the rear thereof and having an enlarged pocket open at the rear thereof and surrounded by the flange, said collet having a threaded end extending into said pocket,

a plate'in'said pocket and held against rotation therein'but movable therein axially of the sleeve, said threaded end of the collet being threaded into the plate, a plurality of dogs pivoted on the flange and extending forwardly thereof and each having a camming surface engaging'the plate a position engaged by the dogs whereby the force I of the dogs on the ring has no component in a direction axially of the ring.

' BERTHOLD DENZLER.

' REFERENCES CITED I The following references are of record in the file of this patent:

UNITED STATES PA'IENTS Number Name Date 347,167 Elmer Aug. 10, '1886 594,077- Gauthier Nov. 23, 1897 1,465,257 Drissner Aug. 21, 1923 1,864,786 Wilkins June 28, 1932 Jellinek Oct. 16, 1945 

